Paint gas supply system, painting plant and method for operating a painting plant

Description

[0001] The invention relates to a paint air supply system, a painting system and a method for operating a painting system.

[0002] It is known from the prior art that improvements in painting processes, particularly for solvent-based and water-based paints (e.g., those that cure), can be achieved by using compressed air enriched with moisture. In particular, the use of compressed air enriched with moisture, especially saturated air, at a relative humidity of, for example, over 40%, can lead to a significant improvement in painting properties and results.

[0003] From DE 10 2018 118 206 A1, published on 31 January 2019, a device for supplying compressed gas to a compressed gas-operated spray device is known, wherein the device comprises at least one connection means for a compressed gas source, wherein the device comprises at least one humidification unit, in particular a tank, wherein the humidification unit comprises a preferably aqueous liquid which is mixed with the compressed gas, and wherein the humidification unit comprises at least one heating means for temperature control of the liquid and / or the compressed gas.

[0004] From DE 10 2017 209 353 A1, a device for repairing surfaces in an aircraft cabin is known, comprising a paint gun, a paint container and a compressed air source, wherein the compressed air source is designed as a compressed air tank, and a pressure regulator is provided for setting a defined air volume flow.

[0005] From EP 2 893 982 A1, a spraying device for atomizing and applying coating material to an object is known, comprising a supply device for supplying water vapor as an atomizing agent from a water vapor generator, wherein the supply device includes a water vapor line for conveying water vapor, wherein the water vapor line is received in an outer temperature control fluid channel surrounding the water vapor line, and wherein a temperature control medium can be guided through the temperature control fluid channel around the water vapor line.

[0006] From WO 2016 / 030012 A2, an activated carbon absorber is known, wherein the activated carbon absorber has a housing for receiving a filter cartridge, which has an air inlet connection for receiving compressed air from an air supply unit, which has a connector for connection to a respiratory mask or hood, which has a unit that can be attached to the body or to or on the housing of the activated carbon absorber and which is able to form a detachable connection, in particular a sliding or gliding connection, with another component.

[0007] Finally, DE 10 2017 109 932 A1 discloses a device for humidifying compressed air, in particular for a compressed air-assisted application device for water-based paint, wherein this comprises a partially water-filled, pressure-resistant container with an air inlet and an air outlet for compressed air, and wherein the air inlet is arranged below a water level of a water bath contained in the container and the air outlet is arranged above the water level of the water bath contained in the container.

[0008] A disadvantage of using known paint sprayer air supply systems is that liquid separators in the compressed air or gas stream typically remove a significant portion of the liquid component relevant to the painting process in order to prevent unwanted liquid accumulation. The as-yet-unpublished German patent application 10 2018 129 038.1 has already proposed an improvement to known paint sprayer air supply systems to prevent such unwanted liquid accumulation in the compressed gas stream. Further practical experience has shown that, in certain cases, increased condensation forms after periods of inactivity, accumulating particularly near the spray gun. In such cases, the spray gun releases this unwanted liquid when a painting process is started.This is referred to as "spitting" from the spray gun, which severely impairs the quality of the paint layer being applied. While the problems described also occur to a lesser extent, they are still relevant when using compressed gases other than those used for spraying. Therefore, the invention aims to propose a spray air supply system, a spraying system, and a method for operating a spraying system, all of which further improve practical suitability with regard to achieving optimal spraying results.

[0009] This problem is solved by the characterizing features of claims 1, 13, and 21, respectively, starting from the features of the preamble. Advantageous and expedient embodiments are specified in the respective dependent claims.

[0010] The inventive painting gas supply system comprises a distributor, wherein the distributor comprises a connector and a plug unit, wherein the connector comprises a first neck, a second neck and a third neck, wherein the plug unit comprises a head with which the plug unit is in particular detachably connected to a free end of the first neck, wherein the plug unit and the connector are connected in such a way and in particular are designed as a single piece in such a way that an interior of the connector is closed and that the interior is sealed by the head of the plug unit in such a way that a pressurized gas with a pressure of up to 20 bar can flow through it, wherein the plug unit comprises a heating probe and wherein the free end of the second neck is designed as a hose connection.

[0011] Such a paint gas supply system can be easily integrated into a new system or retrofitted to an existing system, so that the formation of condensation in front of a paint gun can be avoided by means of the heating probe, since the ability of the pressurized gas to absorb moisture can be kept constant or increased by the heating probe.

[0012] Furthermore, in the inventive paint gas supply system, the heating probe, when connected to the connector unit, extends at least half its length beyond a free end of the second neck. This ensures that the heating probe can transfer its heat output to the pressurized gas not only within the connector but also outside of it.

[0013] The paint gas supply system is also designed to include a first pressure hose, which is a conductive pressure hose, preferably made of rubber, a backflow preventer integrated into or connected to the first pressure hose, and a pressure switch. The pressure switch detects any gas pressure present in the first pressure hose. The pressure switch allows the heating probe and any ionization device to be switched off when the pressure drops, thus preventing an explosion or fire. The paint gas supply system is also designed to shut down if the pressure falls below a threshold of, for example, 0.5 bar. The backflow preventer prevents potentially explosive gas from entering the first pressure hose from the ambient air, thereby providing explosion protection.This effectively prevents ambient gas from entering the spray gun. If the pressure switch shuts off the heating probe, any ionization device, and the spray gas supply system or compressed air supply, the next step involves manually purging the spray gas supply system with compressed gas or an inert purge gas, such as nitrogen (N2). The supplied compressed gas or inert purge gas flows out through the spray gun or a discharge valve, which is located near the end of the first pressure hose or near the spray gun. After purging the spray gas supply system, a manual reset is performed by pressing a reset switch located within the system.

[0014] The paint gas supply system is also designed to include a purge air regulator. This purge air regulator allows for the automated purging of the paint gas supply system with compressed gas after a pressure drop. If a purge air regulator is installed, the purge process is designed to occur automatically. After the heating probe, any ionization device, and the paint gas supply system (or the supply of compressed air) are switched off, the regulator re-injects compressed air and controls its release through the paint gun or a discharge valve. The purge air regulator can also control the reactivation of the heating probe, any ionization device, and the paint gas supply system (or the supply of compressed gas) after purging. Accordingly, the purge air regulator performs a reset.

[0015] Furthermore, it is provided that the heating probe, the ionization device (if present), and the paint gas supply system or the supply of pressurized gas are reactivated by manual reset, e.g., by pressing a reset switch after rinsing.

[0016] Furthermore, the paint gas supply system is designed to include a second pressure hose or line and to have a free end of the third neck serving as a connection point to which a pressurized gas source can be connected directly or via the second pressure hose or line. This allows the manifold to be integrated into various system configurations.

[0017] It is also provided that the heating probe is designed as a flexible element, wherein the heating probe is in particular designed as an electric heating probe, preferably as a heating cable, or wherein the heating probe is in particular designed as a heating probe heated by a liquid, preferably as a heating hose, or wherein the heating probe is in particular designed as a gas heating probe, preferably as a heating line. This makes it possible to extend the heating probe far into the first pressure hose leading to the paint gun, so that the temperature in the first pressure hose can be controlled with equal effectiveness over any section of its length. Alternatively, it is also provided that the heating probe is guided along a pressure hose into a space enclosed by a jacket.Such heating probes can be operated using different energy carriers, so that the distributor can be easily designed for the preferred energy carrier, allowing locally available energy carriers to be used without having to convert the energy form.

[0018] The paint gas supply system also includes a manually operated push button to reset the pressure switch or purge controller after an impermissible pressure drop has been detected. This prevents an automatic restart of the paint gas supply system.

[0019] It can also be provided that the paint gas supply system includes at least one pressure switch, wherein the at least one pressure switch detects a gas pressure present in the first pressure hose, wherein it is specifically provided that the distributor includes an extension which is connected to a free end of the third neck, and the pressure switch is mounted on the extension. If an extension is used, this allows the connection piece to be retrofitted with a pressure switch without having to modify the connection piece.

[0020] It is also possible for the paint gas supply system to include a safety pressure relief valve, which connects the interior of the manifold to the surrounding environment. This provides an additional safety feature to the system simply and without requiring any extra installation effort.

[0021] The connecting piece of the distributor can be designed in different ways, either in such a way that a longitudinal axis of the first neck and a longitudinal axis of the second neck form a common longitudinal axis and a longitudinal axis of the third neck is arranged projecting, in particular at an angle, preferably at right angles to the common longitudinal axis of the first and the second neck, or in such a way that a longitudinal axis of the first neck and a longitudinal axis of the third neck form a common longitudinal axis and a longitudinal axis of the second neck is arranged projecting, in particular at an angle, preferably at right angles to the common longitudinal axis of the first and the third neck, or in such a way that a longitudinal axis of the first neck, a longitudinal axis of the second neck and a longitudinal axis of the third neck are arranged in a Y-shape relative to each other.The first design offers the advantage that the heating probe can be inserted straight through the connector. The second design offers the advantage that the plug unit and the second pressure hose enter the connector from opposite sides. The third design offers the advantage that the connector, due to its shape, is inherently a highly durable component.

[0022] It is also possible for the connector to be designed as a T-piece, in which one of the necks is arranged with its longitudinal axis perpendicular to a common longitudinal axis of the other two necks. In this way, the connector forms a component whose external shape already indicates its functional logic and thus facilitates fault analysis in the event of malfunctions.

[0023] Furthermore, it may also be provided that the heating probe is integrated into a wall of the connection piece and / or that the heating probe is integrated into a jacket of the first pressure hose and, in particular, is integrated all around or surrounds a jacket of the first pressure hose and, in particular, preferably spirally surrounds the first pressure hose and forms a heating jacket or, in particular, runs along a longitudinal extension of the first pressure hose, that it is also provided in particular that the heating probe comprises a heating line or several heating lines that run along a longitudinal axis of the first pressure hose and that the heating probe, in particular, comprises a single heating probe or at least two single heating probes which are arranged along the longitudinal axis, wherein it is in particular provided that the single heating probe or single heating probes are integrated into the jacket orare, whereby it is specifically intended that the first pressure hose is designed as a so-called multi-lumen or multi-chamber hose, which accommodates the compressed air lines and the heating probes or individual heating probes in one or more individual hoses. The first variant has the advantage that it is not necessary for the first pressure hose to be adapted to the heating probe, making this variant particularly suitable for retrofitting existing systems. The second variant has the advantage that the flow path of the first pressure hose is not restricted by the heating probe, so that the compressed gas can flow through the first pressure hose unimpeded despite the heating probe. Furthermore, the second variant has the advantage that the heating probe also provides a kind of insulation, thus slowing down the temperature drop when the heating probe is switched off. Through a circumferential orThe spirally circumferential path of the heating probe largely avoids stiffening of the first pressure hose, thus maintaining its desired flexibility. A combination of the first and second variants results in a particularly long section along which the pressurized gas is heated by the heating probe, allowing it to act very effectively on the gas and prevent condensation.

[0024] It is also planned to design the heating probe as an electric heater, with the electric heater being arranged in an interior space of the first pressure hose, and the first pressure hose being designed as a conductive pressure hose, in particular made of rubber, such that pressurized enclosure according to ATEX corresponding to a protection level "p" is achieved. This makes it possible to operate the paint gas supply system in a potentially explosive atmosphere with simple measures.

[0025] Finally, the paint gas supply system can be designed so that either, if only the first pressure hose of the paint gas supply system is operated in a potentially explosive atmosphere, the first pressure hose is flame-protected by pressurized enclosure and made of a conductive material on the outside, or if the entire paint gas supply system is operated in a potentially explosive atmosphere, all components of the paint gas supply system are flame-protected by pressurized and / or flameproof enclosures, and the first pressure hose is made of a conductive material on the outside. This makes it possible, with minimal effort, to design a paint gas supply system that meets the explosion protection requirements and can therefore be operated in whole or in part in potentially explosive atmospheres.

[0026] In the painting system according to the invention, which comprises a pressurized gas source, which in particular provides moist air or ionized air, a painting gas supply system, a painting gun for spraying a paint and a drainage station, it is provided that a first pressure hose of the painting gas supply system can be selectively connected during operation of the system either to the painting gun or to the drainage station or by means of a T-piece, in particular with the interposition of a further pressure hose to the painting gun and / or to the drainage station and / or that it can in particular also be provided thatthat, preferably when using moist air as the compressed gas, the first pressure hose is connected to a respiratory mask via the T-piece, particularly with an intermediate air purification unit, and / or that the first pressure hose is connected to one or more garments that can be cooled with compressed air via the T-piece, with an intermediate air purification unit. This makes it possible to easily and effectively drain the pressure hose when no painting work is being carried out. Furthermore, this also makes it possible, in particular, to supply breathing air to a respiratory mask via the pressure hose. It may be provided thatthat the breathing air is treated by humidifying the diverted compressed air, and / or that the breathing air is treated by dehumidifying the diverted compressed air, and / or that the breathing air is treated by heating the diverted air, and / or that the breathing air is treated by cooling the diverted air. A breathing air supply system is particularly advantageous when using humid compressed air, as only minimal treatment is required. This also makes it possible to use the diverted compressed air for cooling clothing. Thus, the amount of tubing required to supply breathing air or cooling air for clothing is reduced.

[0027] It is provided that the paint gas supply system of the system is configured according to at least one of claims 1 to 12 and comprises the distributor and the first pressure hose. This results in the advantages stated in the respective claims in combination with the aforementioned drainage function. This means that the formation of condensate can be prevented particularly effectively and that the energy consumption of the heating probe can also be reduced, since the condensate can be effectively drained via the drainage station when no painting activity is taking place and therefore does not need to be kept at temperature or in a gaseous state by increasing the temperature.It is also intended to supply compressed gas via the first pressure hose in the form of moist air with a relative humidity of over 40%, or via the first pressure hose in the form of ionized air, or in the form of N2 or N2-enriched compressed gas, and in particular to provide that the system, and especially the paint gas supply system or, in particular, the distributor, includes a switching device which can be selectively switched to an inflow of moist air or an inflow of ionized compressed gas. This allows a wide variety of painting tasks to be carried out with optimal results. A manual change of the compressed gas can also be provided by connecting the paint gas supply system to a different compressed gas source.The automatic switching capability allows for quick and easy transitions between different painting processes, each requiring humid air, ionized air, another form of compressed air, or nitrogen. Furthermore, it enables the selection of the desired compressed gas for blowing onto components to be painted.

[0028] The system may also include provisions for the distributor either arranged between the pressurized gas source and the first pressure hose and directly connected to the pressurized gas source, or that the distributor is arranged between a second pressure hose or pressure line coming from the pressurized gas source and the first pressure hose, wherein it is particularly provided that the painting gas supply device includes a switching valve which is connected to the distributor and to which at least two pressurized gas sources are connected which provide different pressurized gases.

[0029] This allows different types of systems to be upgraded using the paint gas supply system, as it can be flexibly connected to an existing pressurized gas source via the second pressure hose, or pressurized gases can be mixed.

[0030] Finally, it can also be provided that the heating probe extends from the connection piece over at least 50%, in particular 75%, and preferably at least 90% of the length of the first pressure hose. This allows the pressurized gas flowing or contained in the first pressure hose to be optimally maintained at temperature or heated.

[0031] In a particularly advantageous method for operating a painting plant, in which the plant is designed according to at least one of the preceding claims 13 to 20, it is provided that that before the start of the first painting process, the paint gun is coupled to the first, in particular drained, pressure hose; that the painting process is carried out; that after completion of the first painting process and at the start of a painting break, the paint gun is disconnected from the first pressure hose and can be connected to the drainage station; that while the first pressure hose is connected to the drainage station, any condensation forming in the first pressure hose can be drained from the first pressure hose via the drainage station; that after completion of the painting break and before the start of a second painting process, the first pressure hose is disconnected from the drainage station and the paint gun is reconnected to the first pressure hose.

[0032] This method effectively and cost-efficiently prevents condensate accumulation during periods of inactivity in the painting process. In particular, this method can also be used in systems that are not equipped with a heating probe to prevent condensate formation. For such systems, only the purchase of a dewatering station is required. This method also allows for the proper application of paints used in the aerospace industry, which require adherence to a specific humidity control window. In the method according to the invention, manual or automatic dewatering via the coupling, and especially via the spray gun, can be performed as an alternative to connecting to the dewatering station.

[0033] As a supplement to the operating procedure for a painting system, it is also provided that, prior to the painting process, metal or plastic parts to be painted are statically discharged by blowing them with air supplied via the first pressure hose. For this purpose, compressed air, warm compressed air, or ionized compressed air is used. In particular, ionization is carried out by an ionization device connected to the first pressure hose via a distributor. This makes it possible to optimize the painting process with minimal or no additional equipment. It is also provided that the painting process can be carried out with ionized compressed gas.

[0034] For the purposes of this invention, a compressed gas is to be understood in a broader sense as both compressed air and compressed gases of other types, in particular nitrogen or compressed gas mixtures, which can in particular also contain high moisture content and are used in the painting process.

[0035] The term "type of ignition protection" is a designation from explosion protection, referring to various design principles in this field. The underlying principle of every type of ignition protection is to minimize the risk of an explosive atmosphere and ignition sources being present simultaneously.

[0036] The overpressure enclosure (Ex-p) type of ignition protection allows non-explosion-proof devices to be operated in potentially explosive atmospheres. The underlying principle of overpressure enclosure is to keep explosive gas mixtures away from the non-Ex devices used. For the purposes of this invention, the overpressure enclosure type of ignition protection – abbreviated Ex-p – is understood to be ignition protection based on the operation of non-explosion-proof devices in an overpressure-enclosed housing. Here, the housing is protected from the ingress of potentially explosive atmospheres present in the surrounding area by a permanently maintained overpressure inside the housing. Any ignitable gas / air mixture that may be present inside the housing is removed by purging the device before commissioning and / or after a malfunction. This can be done manually or automatically.

[0037] For the purposes of this invention, the ignition protection method "flameproof enclosure" – abbreviated Ex d – is understood to mean ignition protection based on the containment of a potential explosion occurring inside an enclosure. Accordingly, the enclosure is designed to be explosion-pressure resistant and has flameproof gaps at all enclosure openings. Furthermore, it is ensured that the surface temperature of the enclosure remains below the ignition temperature of the surrounding explosive atmosphere, even in the event of an anticipated fault. The requirements for equipment that meets this type of ignition protection are described in standard EN 60079-1.

[0038] For the purposes of the invention, a dissipative object is understood to be an object that has a higher electrical resistance than conductive objects, but does not become dangerously charged when in contact with ground and is not exposed to strong charge-generating processes. In particular, this can be a dissipative object with a maximum resistance of 1 MΩ.

[0039] For the purposes of the invention, ATEX conformity means that the paint gas supply system, with its distributor and its connected pressure hose leading to a paint gun, as well as its heating probe, is designed by means of its pressure switch and its backflow preventer connected to the pressure hose and its conductive pressure hose, and optionally also by means of its regulator for purge air and / or manual purge, in such a way that the ATEX Directive 94 / 9 / EC (ATEX 95) or a comparable directive is complied with and / or that equipment protection by means of pressurized enclosure is achieved in accordance with at least one of the protection levels "pyb" and / or "pxb" and / or "pzc".In case of danger, which is detected by a drop in pressure in the first pressure hose, manual or automated purging of the paint gas supply system is possible after switching off the heating probe and any ionization device that may be present.

[0040] Further details of the invention are described in the drawing with reference to schematically illustrated embodiments. Figures 1 and 2 show various embodiments of the invention described above.

[0041] This shows: Figure 1: a schematic view of a first embodiment of a paint gas supply system; Figure 2: a schematic view of a second embodiment of a paint gas supply system; Figure 3: a schematic view of a third embodiment of a paint gas supply system; Figure 4: a schematic side view of a first painting system; and Figure 5: a schematic side view of a second painting system.

[0042] In the Figure 1Figure 1 shows a schematic representation of a first embodiment of a paint gas supply system 101. This system comprises a distributor to which a first embodiment of a first pressure hose 151 is connected. The distributor 102 includes a connector 103 and a plug unit 104. The connector 103 comprises a first neck 105, a second neck 106, and a third neck 107. The plug unit 104 comprises a head 108, with which the plug unit 104 is detachably connected to a free end 105a of the first neck 105.

[0043] The plug unit 104 and the connector 103 are connected such that an interior 109 of the connector 103 is closed and that the interior 109 is sealed by the head 108 of the plug unit 104 in such a way that a pressurized gas DG at a pressure of up to 20 bar can flow through it. The plug unit 104 includes a heating probe 110. A free end 106a of the second neck 106 is designed as a hose connection 111, to which the first pressure hose 151 leading to a spray gun (not shown) is connected. According to one embodiment, the plug unit 104 and the connector 103 are designed as a single component made of one material.

[0044] A free end 107a of the third neck 107 is configured as a connection 112, to which a pressurized gas source (not shown) is connected via a second pressure hose 161. Alternatively, the distributor 102 can be connected directly to the pressurized gas source. The heating probe 110 is designed as a flexible element that adapts to the contours of the first pressure hose 151.

[0045] The heating probe 110 is designed as an electric heating probe 113 in the form of a heating cable 114. A dashed line indicates the Figure 1A wall 171 is indicated, separating a potentially explosive atmosphere (room 172) located to the right of the wall 171 from a non-explosive atmosphere 173 located to the left of the wall 171. The first pressure hose 151 and the heating probe 110 running through it pass through the wall 171, so that the distributor 102 is located in the non-explosive atmosphere 172 and can therefore be designed more simply and thus more cost-effectively. A backflow preventer 180 is arranged at the end 151b of the pressure hose 151 opposite the hose connection 111, upstream of the aforementioned (not shown) paint gun. This prevents, in particular, the unwanted inflow of potentially explosive ambient air, e.g., via the paint gun, even when the first pressure hose 151 is depressurized or has low pressure.This backflow preventer 180 also prevents pressurized gas DG from flowing back against a flow direction x. Furthermore, the first pressure hose 151 is designed to be conductive due to a rubber sheath. Alternatively, the rubber hose can also be designed as a solid rubber hose. The distributor 101 also includes a regulator 181 for purge air.

[0046] The paint gas supply system 101 comprises an extension 115, which is connected to the free end 107a of the third neck 107 of the distributor 102 and, in this embodiment, is formed by the second pressure hose 161. The paint gas supply system 101 also includes a pressure switch 116, which is mounted on the extension 115. Alternatively, the pressure switch can also be mounted in other areas of the paint gas supply system. The pressure switch 116 detects the gas pressure present in the pressure hose 151 via an interior 117 of the distributor 102. The aforementioned regulator 181 enables, for example, automatic purging with pressurized gas DG when the pressure switch 116 detects a pressure below 0.5 bar and has triggered a shutdown of the paint gas supply system 101.Alternatively, instead of the regulator 181 and the pressure switch 116, only a pressure switch may be present, in which case flushing is carried out manually.

[0047] The paint gas supply system 101 includes a safety pressure relief valve 118, wherein a connection is established between the interior 117 of the distributor 102 and an environment U by means of the safety pressure relief valve 118.

[0048] The paint gas supply system 101 also includes a pressure regulator 119, which is connected to the extension 115. Alternatively, it is also possible to connect the pressure regulator to the third neck.

[0049] The heating probe 110 extends, in the installed state, more than half its length HL110 beyond the free end 106a of the second neck 106 into the pressure hose 151, with respect to its total length L110.

[0050] The connecting piece 103 is designed such that a longitudinal axis LA105 of the first neck 105 and a longitudinal axis LA106 of the second neck 106 form a common longitudinal axis A156 and a longitudinal axis LA107 of the third neck 107 is arranged perpendicular to the common longitudinal axis A156 of the first and second necks 105, 106.

[0051] Accordingly, the connecting piece 103 is designed as a T-piece, in which the third neck 107 is arranged with its longitudinal axis LA107 at right angles to the common longitudinal axis LA156 of the other two necks 105, 106.

[0052] In the Figure 2 A second embodiment of a paint gas supply system 201 is shown in a schematic view. Here, a distributor 202 is connected to a second embodiment of a first pressure hose 251. For this second embodiment, please refer to the description of the Figure 1 referred to. Here, the correspondences to the Figure 1 The specified reference numerals are each followed by the reference numerals of the above, increased by 100. Figure 2 Unlike the one in the Figure 1 In the illustrated embodiment, a heating probe 210 is designed as a gas-heated heating probe 213 in the form of a heating cable 214 and is configured in such a way that it complies with Directive 94 / 9 / EC (ATEX 95), thus allowing the distributor 202 to be installed in a potentially explosive atmosphere 272. Similarly, a pressure switch 216 is also installed in such a way that it complies with Directive 94 / 9 / EC (ATEX 95).

[0053] According to one embodiment, the plug unit 204 and the connector 203 are designed as a single component made from one material.

[0054] Upstream of the aforementioned, but not shown, spray gun, a backflow preventer 280 is arranged at one end 151b of the pressure hose 251, opposite the hose connection 211. This prevents ambient air from flowing in when the pressure is depressurized or low. This backflow preventer 280 also prevents compressed gas DG from flowing back against a flow direction x. The distributor 201 also includes a regulator 281 for purge air. If the pressure is too low, the regulator 281 receives a signal from the pressure switch 216 and then initiates automatic purge by a purge device. This system is ATEX compliant.

[0055] In the Figure 3A third embodiment of a paint gas supply system 301 is shown in a schematic view, wherein a distributor 302 is connected to a third embodiment of a first pressure hose 351. For this third embodiment, reference is made to the description of the Figure 1 referred to. Here, the correspondences to the Figure 1 The specified reference numerals are each followed by the reference numerals increased by 200. Figure 3 . Unlike the Figure 1A heating probe 310 is designed as a liquid-heated heating probe 313 in the form of a heating hose 314. Furthermore, a longitudinal axis L305 of a first neck 305 and a longitudinal axis L307 of a third neck 307 form a common longitudinal axis LA357, and a longitudinal axis L306 of the second neck 306 is arranged perpendicular to the common longitudinal axis LA357 of the first and third necks 305, 307. The aforementioned heating probe 310 is integrated into a sheath M351 of the first pressure hose 351 and runs along its longitudinal extent within this sheath. Alternatively, it is also provided that the heating probe runs spirally around the first pressure hose in the direction of its longitudinal extent. In both embodiments, it is also possible for the heating probe to run within the sheath in an interior space of the first pressure hose.

[0056] According to one embodiment, the plug unit 304 and the connector 303 are designed as a single component made from one material.

[0057] Upstream of the aforementioned, but not shown, paint gun, a backflow preventer 380 is arranged at one end 351b of the pressure hose 351, opposite the hose connection 311. This prevents the inflow of ambient air in a pressureless or low-pressure state. e.g. via the spray gun. This backflow preventer 380 also prevents pressurized gas DG from flowing back against a flow direction x. The distributor 301 also includes a regulator 381 for purge air, whereby the regulator 381 receives a signal from the pressure switch 316 if the pressure is too low and then ensures automatic purging by a purge device. This is ATEX compliant.

[0058] In the Figure 4Figure 1 shows a schematic side view of a first system 1.1 for painting. The first system 1.1 includes a pressurized gas source 2 for pressurized gas. 3. The compressed gas 3 is a moist compressed gas with a relative humidity of over 40%. System 1.1 comprises a first paint gas supply system LZ1, which includes a distributor 7 and a first pressure hose 4 and which can be configured in detail according to one of the previously described paint gas supply systems. Furthermore, system 1.1 includes a spray gun 5 for spraying paint and can, as shown, include a drain station 6 for draining the pressure hose 4. During operation of system 1.1, the pressure hose 4 is optionally connected to either the spray gun 5 or the drain station 6.

[0059] If necessary, the pressure hose 4 can be manually drained by first blowing compressed air 3 out of the spray gun 5 without any paint or varnish supply before starting a painting process. The spray gun 5 is positioned so that the air is blown past a component to be painted (not shown).

[0060] Optionally, the pressure hose 4 can also be connected to a respiratory mask 23 via a T-piece. This can be done with the interposition of a breathing air purification unit 22.

[0061] The distributor 7 is positioned between the pressurized gas source 2 and the pressure hose 4 and is thus directly connected to the pressure hose 4. Alternatively, the distributor 7 can either be connected to the pressurized gas source 2 via a second pressure hose (not shown) or directly to the pressurized gas source.

[0062] Furthermore, the distributor 7 includes a connector 8 and a heating probe 9, the heating probe 9 extending from the connector 8 over a length L4 of the first pressure hose 4.

[0063] The first pressure hose 4 is connected at one end 4a via the distributor 7 to the pressurized gas source 2 and at its other end 4b optionally to the spray gun 5 or the draining station 6. According to an embodiment not shown, the pressure hose can also be connected at its other end via a T-piece to both the spray gun and the draining station. For this purpose, the first pressure hose 4 includes a hose coupling K4b at its other end 4b, and the spray gun 5 includes a gun coupling K5 adapted to the hose coupling K4b, and the draining station 6 includes a coupling K6 adapted to the hose coupling K4b. The draining station 6 has a so-called "bleeding function" by means of which a continuous gas flow and thus continuous drainage of the first pressure hose 4 is possible when the spraying process is not in operation.The heating probe 9 surrounds the pressure hose 4 in a spiral pattern, forming a hose heater. This heating probe 9 can also be used in accordance with the instructions for the [reference to the text]. Figures 1 to 3 The heating probe 9 can be configured as an internal heating probe running within the pressure hose 4 or as a heating probe 9 embedded in a sheath of the pressure hose 4 (not further specified in the schematic diagram). Heating can be achieved electrically, with heating gas, or with hot water using the heating probe 9. The heating probe is ATEX compliant. For detailed designs of the manifold and its heating probe, please refer to the description of the Figures 1 to 3 referred to. The one in the Figure 4 The first system shown, 1.1, can be combined with any paint gas supply system described in the figure description or arising from the claims.

[0064] The first system 1.1 includes a backflow preventer 20. This is located in a region of the second end 4b of the first pressure hose 4. This backflow preventer 20 prevents pressurized gas DG from flowing back into the pressure hose 4 against a flow direction x. Furthermore, the first system 1.1 includes a pressure switch 16, which monitors the pressure in an interior space of the pressure hose 4. The first paint spraying air supply system LZ1 of the first system 1.1 can also include a regulator 21 for purge air. In the event of insufficient pressure, the regulator 21 receives a signal from the pressure switch 16 and then initiates automatic purge by a purge device. The components of the first system 1.1 are ATEX compliant.

[0065] In the Figure 5 A schematic side view of a second system 1.2 for painting is shown. The second system 1.2 includes a pressurized gas source 2 for pressurized gas. 3.The compressed gas 3 is either ionized compressed gas, in particular ionized compressed air, ionized nitrogen, nitrogen-enriched ionized compressed air, ionized carbon dioxide, or a non-ionized compressed gas. The second system 1.2 comprises a second paint gas supply system LZ2, which includes a distributor 7 and a first pressure hose 4 and which, in detail, can be designed at least partially according to one of the previously described paint gas supply systems. Furthermore, the second system 1.2 includes a paint gun 5 for spraying paint. During operation of the second system 1.2, the pressure hose 4 is connected to the paint gun 5. Optionally, the pressure hose 4 can also be connected to a respiratory mask 23 via a T-piece. This can be done with the interposition of a breathing air purification unit 22.

[0066] If necessary, the pressure hose 4 can be manually drained by first blowing compressed air 3 out of the spray gun 5 without any paint or varnish supply before starting a painting process. The spray gun 5 is positioned so that the air is blown past a component to be painted (not shown).

[0067] The distributor 7 is positioned between the pressurized gas source 2 and the pressure hose 4 and is thus directly connected to the pressure hose 4. Alternatively, the distributor 7 can either be connected to the pressurized gas source 2 via a second pressure hose (not shown) or directly to the pressurized gas source.

[0068] Furthermore, the distributor 7 includes a connector 8 and a heating probe 9, the heating probe 9 extending from the connector 8 over a length L4 of the first pressure hose 4.

[0069] The first pressure hose 4 is connected at one end 4a via the distributor 7 to the pressurized gas source 2 and at its other end 4b detachably connected to the spray gun 5. For this purpose, the first pressure hose 4 includes a hose coupling K4b at its second end 4b, and the spray gun 5 includes a gun coupling K5 adapted to the hose coupling K4b. The heating probe 9 is designed as an electric heating probe and runs along the longitudinal axis in an interior space 4i of the pressure hose 4. A jacket 4m, which forms the pressure hose 4, is made of a conductive material, in particular rubber. Thus, the second system 1.2 is ATEX-compliant in a potentially explosive atmosphere 72. In particular, the system 1.2 is ATEX-compliant according to pressurized enclosure, achieving in particular a protection level pxb, pyb, or pzc. The distributor 7 can be used, at least in part, according to the description of the Figures 1 to 3must be executed.

[0070] The second system 1.2 includes a backflow preventer 20. This is located in a region of the second end 4b of the first pressure hose 4. This backflow preventer 20 prevents gas from flowing into the pressure hose 4 against a flow direction x, particularly via the spray gun 5. Furthermore, the spray air supply system LZ2 of the second system 1.2 includes a pressure switch 16, which monitors the pressure prevailing in the interior 4i of the pressure hose 4 and, if the pressure drops below, for example, 0.5 bar, switches off both the heating probe 9 and an ionization device 50. The ionization device 50 is located in the Figure 5The second system 1.2 is shown only schematically and can alternatively be arranged before, inside, or after the pressure hose 4. Furthermore, the second system 1.2 includes either a regulator 21 for purge air or a reset switch 51, so that after a shutdown caused by the pressure switch, purging of the pressure hose 4 either occurs automatically and the second system 1.2 is automatically restarted, or purging is performed manually and the second system 1.2 is then manually restarted via the reset switch 51.

[0071] Based on the Figure 4 described first Annex 1.1 or on the basis of the one relating to the Figure 5 The second system 1.2 described provides a method for operating the first system 1.1 or the second system 1.2 for painting: that before the start of the first painting process, the paint gun 5 is coupled to the first pressure hose 4, that the painting process is carried out, that after completion of the first painting process and at the start of a painting break, the paint gun 5 is disconnected from the first pressure hose 4 and can be connected to the drainage station 6, that while the first pressure hose 4 is connected to the drainage station 6, any condensation forming in the first pressure hose 4 is drained from the first pressure hose 4 via the drainage station 6, that after completion of the painting break and before the start of a second painting process, the first pressure hose 4 is disconnected from the drainage station 6 and the paint gun 5 is reconnected to the pressure hose 4.

[0072] It is also possible, in particular, to combine the systems 1.1 and 1.2 described above as examples into a single system using a single pressure hose. The compressed gas source can optionally provide at least one of the aforementioned and subsequently listed compressed gases.

[0073] For the design variants of the Figures 1 to 5 It is stipulated that the following applies as compressed gas 3 or painting gas to the painting gas supply system 101 or 201 or 301: humidified air or warm humidified air or air ionized with 1 to 30 kV or warm air ionized with 1 to 30 kV or nitrogen or nitrogen-enriched compressed air or warm nitrogen or nitrogen-enriched warm compressed air or compressed air or warm compressed air or another compressed gas such as e.g. Carbon dioxide is added.

[0074] Activating the hose heater warms the compressed gas. A selector valve allows the system to be operated with a variety of compressed gases, including compressed air, ionized compressed air, humidified compressed air, nitrogen, or nitrogen-enriched compressed air. If ionized or humidified compressed air is selected, metal or plastic parts being treated can be statically discharged in preparation for the painting process. A selector valve allows the system to choose between different compressed gases. If ionized or humidified compressed air is selected and used as the painting air, metal or plastic parts can be statically discharged during the painting process and / or not accumulate as much static charge as when using air as the compressed gas.

[0075] In principle, all versions of the paint gas supply system, regardless of the above specifications, comply with ATEX standards. Reference symbol list:

[0076] 1.1, 1.2 first / second system 2 Compressed gas source 3 Compressed gas 4 first pressure hose 4a first end of 4 4b second end of 4 4i interior of 4 4m jacket of 4 5 Paint gun 6 Drainage station 7 Distributor 8 Connector 9 Heating probe 16 Pressure switch 20 Backflow preventer 21 Purge air regulator 22 Breathing air preparation unit 23 Respirator 50 Ionization unit 51 Reset switch 72 Potentially explosive atmosphere K4b Hose coupling K5 Gun coupling K6 Coupling LZ1, LZ2 first / second paint gas supply system 101 Paint gas supply system 102 Distributor 103 Connector from 102 104 Plug unit from 102 105 First neck from 103 105a Free end from 105 106 Second neck from 103 106a Free end from 106 107 Third neck from 103 107a Free end from 107 108 Head from 104 109 Interior of 103 110 Heating probe 111 Hose connection 112 Connection 113 Electric heating probe 114 Heating cable 115 Extension 116 Pressure switch 117 Interior of 102 118 Safety pressure relief valve 119 Pressure regulator 151 First pressure hose 151b End of 151 161 Second pressure hose 171 Wall 172 Potentially explosive atmosphere 173 Non-potentially explosive atmosphere 180 Backflow preventer 181 Purge air regulator HL110 half length of 110 L110 length of 110 LA105 longitudinal axis of 105 LA106 longitudinal axis of 106 LA107 longitudinal axis of 107 LA156 common axis of 105 and 106 U environment 201 paint gas supply system 202 distributor 203 connector of 202 204 plug unit of 202 205 first neck of 203 205a free end of 205 206 second neck of 203 206a free end of 206 207 third neck of 203 207a free end of 207 208 head of 204 209 interior of 203 210 heating probe 211 hose connection 212 connection 213 Gas heating probe 214 Heating line 215 Extension 216 Pressure switch 217 Interior of 202 218 Safety pressure relief valve 219 Pressure regulator 251 First pressure hose 251b End of 251 261 Second pressure hose 272 Potentially explosive atmosphere 280 Backflow preventer 281 Purge air regulator LA205 Longitudinal axis of 205 LA206 Longitudinal axis of 206 LA207 Longitudinal axis of 207 LA256 Common axis of 205 and 206 301 Paint gas supply system 302 Distributor 303 Connector from 302 304 Plug unit from 302 305 First neck from 303 305a Free end from 305 306 Second neck from 303 306a Free end from 306 307 Third neck from 303 307a Free end from 307 308 Head from 304 309 Interior of 303 310 Heating probe 311 Hose connection 312 Connection 313 Liquid-heated heating probe 314 Heating hose 315 Extension 316 Pressure switch 317 Interior of 302 318 Safety pressure relief valve 319 Pressure regulator 351 First pressure hose 351b End of 351 361 Second Pressure hose 380 Backflow preventer 381 Regulator for purge air LA357 common longitudinal axis L305 longitudinal axis L306 longitudinal axis L307 longitudinal axis M351 shell of 351 x Flow direction

Claims

1. Coating gas supply system (101; 201; 301; LZ1; LZ2) comprising a distributor (102; 202; 302; 7), wherein the distributor (102; 202; 302; 7) comprises a connector piece (103; 203; 303) and a plug unit (104; 204; 304), - wherein the connector piece (103; 203; 303) comprises a first neck (105; 205; 305), a second neck (106; 206; 306) and a third neck (107; 207; 307), - wherein the plug unit (104; 204; 304) comprises a head (108; 208; 308) by means of which the plug unit (104; 204; 304) is connected to a free end (105a; 205a; 305a) of the first neck (105; 205; 305), - wherein the plug unit (104; 204; 304) comprises a heating probe (110; 210; 310; 9) and - wherein the free end (106a; 206a; 306a) of the second neck (106; 206; 306) is designed as a hose connection (111; 211; 311), characterised in - that the plug unit (104; 204; 304) and the connector piece (103; 203; 303) are connected in such a way that an interior (109; 209; 309) of the connector piece (103; 203; 303) is closed in such a way and in that the interior (109; 209; 309) is sealed by means of the head (108; 208; 308) of the plug unit (104; 204; 304) in such a way that a pressurised gas (DG; 3) can flow through it at a pressure of up to 20 bar, - that the heating probe (110; 210; 310; 9) extends with at least half of its length (HL110) beyond a free end (106a; 206a; 306a) of the second neck (106; 206; 306) when the plug unit (104; 204; 304) is connected to the connector piece (103; 203; 303).

2. Coating gas supply system according to claim 1, characterised in that the coating gas supply system (101; 201; 301; LZ1; LZ2) - comprises a first pressure hose (151; 251; 351; 4), which is designed as a conductive pressure hose and in particular as a rubber hose, - wherein the coating gas supply system comprises a backflow preventer (180; 280; 380; 20) installed in the first pressure hose (151; 251; 351; 4) or connected to the first pressure hose (151; 251; 351; 4) and / or - wherein the coating gas supply system comprises a pressure switch (116; 216; 316; 16) and in particular a reset switch (51), wherein the pressure switch (116; 216; 316; 16) detects a gas pressure present in the first pressure hose (151; 251; 351; 4) and wherein by means of the reset switch (51) the pressure switch (16) can be reset after detection of a pressure which is too low.

3. Coating gas supply system according to claim 2, characterised in that the coating gas supply system comprises a regulator (181; 281; 381; 21) for purging air.

4. Coating gas supply system according to claim 1 or 2 or 3, characterised in that the coating gas supply system (101; 201; 301; LZ1; LZ2) comprises a second pressure hose (161; 261; 361) or a second pressure line and in that a free end (107a; 207a; 307a) of the third neck (107; 207; 307) is designed as a connector (112; 212; 312) to which a pressurised gas source (2) is connected directly or with the second pressure hose (161; 261; 361) or the second pressure line being connected in between.

5. Coating gas supply system according to claim 1 or 2 or 3, or 4, characterised in that the heating probe (110; 210; 310; 9) is designed as a flexible element, - wherein the heating probe (110; 9) is designed in particular as an electrical heating probe (113), preferably as a heating cable (114), or - wherein the heating probe (210) is designed in particular as a heating probe (213) heated by a liquid, preferably as a heating hose (214), or - wherein the heating probe (310) is designed in particular as a gas heating probe (313) heated by a gas, preferably as a heating line (314).

6. Coating gas supply system according to claim 2, characterised in that the distributor (102; 202; 302; 7) comprises an extension (115; 215; 315) which is connected to a free end (107a; 207a; 307a) of the third neck (107; 207; 307), and the pressure switch (116; 216; 316) is mounted on the extension (115; 215; 315).

7. Coating gas supply system according to at least one of the preceding claims, characterised in - that the coating gas supply system (101; 201; 301; LZ1; LZ2) comprises a safety pressure relief valve (118; 218; 318), - wherein a connection between the interior (117; 217; 317) of the distributor (102; 202; 302) and an environment (U) is established by the safety pressure relief valve (118; 218; 318).

8. Coating gas supply system according to at least one of the preceding claims, characterised in that the connector piece (103; 203; 303) is designed in such a way that - either a longitudinal axis (LA105; LA205) of the first neck (105; 205) and a longitudinal axis (LA106; LA206) of the second neck (106; 206) form a common longitudinal axis (LA156; LA256) and a longitudinal axis (LA107; LA207) of the third neck (107; 207) is arranged projecting, in particular at an angle, preferably at a right angle to the common longitudinal axis (LA156; LA256) of the first and second necks (105, 106; 205, 206) - or a longitudinal axis (LA305) of the first neck (305) and a longitudinal axis (LA307) of the third neck (307) form a common longitudinal axis (LA357) and a longitudinal axis (LA306) of the second neck (306) is arranged projecting, in particular at an angle, preferably at a right angle to the common longitudinal axis (LA357) of the first and third necks (305, 307) - or a longitudinal axis of the first neck, a longitudinal axis of the second neck and a longitudinal axis of the third neck are arranged Y-like to one another.

9. Coating gas supply system according to claim 2, characterised in - that the heating probe (110; 210; 310; 9) is integrated into a wall of the connector piece (103; 203; 303) and / or - that the heating probe (310; 9) is integrated into a jacket (M351; 4m) of the first pressure hose (351; 4) and in particular is integrated circumferentially or surrounds a jacket (M351) of the first pressure hose (4) and in particular runs around the first pressure hose (4) preferably in a spiral and forms a heating jacket or in particular runs along a longitudinal extension of the first pressure hose, - that it is in particular also provided that the heating probe comprises a heating line or several heating lines which run along a longitudinal axis of the first pressure hose and that the heating probe comprises in particular a single heating probe or at least two single heating probes which are arranged along the longitudinal axis, wherein it is in particular provided that the single heating probe or single heating probes are integrated into the jacket, wherein it is in particular also provided that the first pressure hose is designed as a so-called multi-lumen hose or multi-chamber hose, which accommodates the compressed air lines and the heating probes or individual heating probes in a single hose or in several individual hoses.

10. Coating gas supply system according to claim 2, characterised in that the first pressure hose (151; 251; 351; 4) comprises a heater in such a way that ATEX conformity according to pressurised enclosure and corresponding to a protection level "p" is achieved.

11. Coating gas supply system according to claim 2, characterised in that the first pressure hose (151; 251; 351; 4) comprises a heater and is designed as a conductive hose and / or comprises a pressure switch (16; 116; 216; 316) which detects a pressure within the first pressure hose (151; 251; 351; 4) and / or comprises a manual and / or automated flushing device, such that ATEX conformity according to pressurised enclosure and in particular according to a protection level "p" is realised.

12. Coating gas supply system according to claim 2, characterised in that the first pressure hose (151; 251; 351; 4) comprises a heater and is designed as a conductive hose and / or comprises a pressure switch (16; 116; 216; 316) which detects a pressure within the first pressure hose (151; 251; 351; 4) and / or comprises a manual and / or automated flushing device such that ATEX conformity is realised in accordance with pressurised enclosure and corresponding to a protection level "p" and in accordance with the ignition protection type pxb and / or pyb and / or pzc.

13. System for coating (1.1; 1.2), wherein the system (1.1; 1.2) comprises a compressed gas source (2) which provides moist compressed air as the compressed gas (39), characterised in that this compressed gas source (2) provides a moist compressed air with a relative humidity of at least 30% and preferably at least 40% and is used by means of a coat spray gun (5) for spraying a paint and / or is connected to a breathing mask (23) by means of at least one distributor piece, which is designed in particular as a T-piece, that the system (1.1; 1. 2) comprises a coating gas supply system (101; 201; 301; LZ1; LZ2), wherein the coating gas supply system (101; 201; 301; LZ1; LZ2) of the system (1.1; 1.2) is designed according to claims 1 and 2 and in particular according to at least one of claims 3 to 12 and comprises the distributor (7; 102; 202; 302) and the first pressure hose (4).

14. System for coating according to claim 13, wherein the system (1.1; 1.2) comprises a compressed gas source (2) which provides ionised compressed gas as compressed gas (3), characterised in that this compressed gas source (2) provides an ionised compressed gas in the form of - ionised compressed air or - ionised nitrogen or - ionised compressed air enriched with nitrogen and is used by means of a coat spray gun (5) for spraying a paint and / or is used for static discharge of metal and / or plastic surfaces by blowing.

15. System for coating according to at least one of claims 13 or 14, wherein the system (1.1; 1.2) comprises a pressurised gas source (2) which provides ionised pressurised gas as the pressurised gas (3), characterised in that this ionised compressed gas is used by means of a coat spray gun (5) for spraying a paint and / or is connected to a breathing mask (23) by means of at least one distributor piece, which is designed as a T-piece.

16. System according to one of the preceding claims 13 to 15, characterised in that the system (1.1; 1. 2) comprises a coat gas supply system (101; 201; 301; LZ1; LZ2) according to claims 1 and 2, comprises the first pressure hose (4; 151; 251; 351) and is connected to a breathing mask (23) by means of at least one distributor piece, which is designed in particular as a T-piece, and / or is connected to one or more items of clothing that can be cooled by means of compressed air by means of at least one branch, and in particular that a compressed air treatment device is located upstream of the breathing mask (23) or the at least one item of clothing and in particular by means thereof the compressed gas (3) is either cooled or heated and / or either humidified or dehumidified.

17. System for coating according to at least one of claims 13 to 16, wherein the system (1) comprises a compressed gas source (2), a coating gas supply system (101; 201; 301; LZ1; LZ2) according to claims 1 and 2, a coating gun (5) for spraying a paint and a dewatering station (6), characterised in that a first pressure hose (4) of the coating gas supply system (101; 201; 301; LZ1; LZ2) is optionally connected to the spray gun (5) or to the dewatering station (6) during operation of the system (1) or is connected to the spray gun (5) and / or to the dewatering station (6) by means of a distributor piece, which is designed as a T-piece, with the interposition of a further pressure hose, and - that it is also provided that, preferably when moist air is used as the pressurised gas (3), the first pressure hose (4) is connected to a breathing mask (23) with the interposition of a breathing air treatment device (22) and / or - in that the first pressurised hose (4) is connected to one or more items of clothing which can be cooled by means of compressed air, with a cooling air supply device connected in between.

18. System according to claim 17, characterised in that the coat gas supply system (101; 201; 301; LZ1; LZ2) of the system (1) is designed according to claims 1 and 2 and in particular at least one of claims 1 to 13 and comprises the distributor (7; 102; 202; 302) and the first pressure hose (4).

19. System according to at least one of the preceding claims 17 or 18, characterised in that the distributor (7; 102; 202; 302) - is either arranged between the pressurised gas source (2) and the first pressure hose (4) and is connected directly to the pressurised gas source (2) - or that the distributor (102; 202; 302; 7) is arranged between a second pressurised hose coming from the pressurised gas source (2) and the first pressurised hose (4), and - that it is provided in particular that the coat gas supply device (101; 201; 301; LZ1; LZ2) comprises a switch valve which is connected to the distributor (102; 202; 302; 7) and to which at least two pressurised gas sources (2) are connected, which provide different pressurised gases (DG; 3).

20. System according to at least one of the preceding claims 17 to 19, characterised in that a heating probe (110; 210; 310; 9) extends from the connector piece (103; 203; 303) over at least 50%, in particular 75% and preferably at least 90% of a length of a or the first pressure hose (151; 10).

21. Method for operating a system (1) for coating, wherein the system (1) is designed according to at least one of the preceding claims 13 to 20, characterised in that from a or the first pressure hose (4) before a coating process and / or after a coating process and / or in a coating pause between two coating processes, condensation water forming in the first pressure hose (4) is discharged, in that the first pressure hose (4) is connected to the dewatering station (6) and / or condensation water forming from the first pressure hose (4) is discharged into the atmosphere by means of the pressurised gas (3) by a manual and / or automated or programmed process.

22. Method for operating a system (1) for coating according to claim 21, wherein the system (1) is designed in particular according to at least one of the preceding claims 13 to 20, characterised in - that the spray gun (5) is coupled to a or the first pressure hose (4) before the start of a first coating process, - that the coating process is carried out, - that after completion of the first coating process and with the start of a coating pause, the coat spray gun (5) is uncoupled from the first pressure hose (4) and connected to the dewatering station (6), - that, while the first pressure hose (4) is connected to the dewatering station (6), condensation forming in the first pressure hose (4) is drained from the first pressure hose (4) via the dewatering station (6), - that after completion of the coating pause and before the start of a second coating process the first pressure hose (4) is uncoupled from the drainage station (6) and the spray gun (5) is recoupled to the first pressure hose (4).

23. Method according to claim 22, characterised in that, before the coating process is carried out, metal parts or plastic parts to be coated are statically discharged by blowing with air supplied via the first pressure hose (4) in preparation for the coating process, compressed air or warm compressed air or ionised compressed air or nitrogen or compressed air enriched with nitrogen being supplied for this purpose, it being provided in particular that ionisation is carried out by an ionisation device which is connected to the first pressure hose via a distributor.